UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
ASSETS
Cash and cash equivalents	$ 62,361	$ 85,109
Cash held by 1031 exchange facilitator	6,721	0
Inventories	83,399	77,000
Assets held for sale	4,739	6,466
Prepaid insurance	7,192	1,790
Other current assets	23,612	16,344
Total current assets	231,036	231,998
Property, plant and equipment, net	241,153	223,902
Intangibles, net	5,764	6,006
Deferred income taxes	15,018	15,081
Investments in unconsolidated subsidiaries	15,371	12,371
Operating lease right-of-use assets	8,080	8,667
Other non-current assets	43,636	41,683
Total assets	560,058	539,708
LIABILITIES AND EQUITY
Revolving credit agreements	27,500	10,000
Current maturities of long-term debt	4,369	3,953
Asset retirement obligations	13,095	13,114
Accrued payroll	12,927	17,317
Deferred revenue	843	878
Other current liabilities	7,475	7,118
Total current liabilities	81,826	69,986
Long-term debt	29,027	22,003
Operating lease liabilities	8,039	8,782
Asset retirement obligations	38,779	39,499
Pension and other postretirement obligations	4,904	5,183
Liability for uncertain tax positions	5,795	5,795
Other long-term liabilities	7,598	6,120
Total liabilities	175,968	157,368
Common stock:
Capital in excess of par value	30,451	28,672
Retained earnings	355,786	355,873
Accumulated other comprehensive loss	(9,501)	(9,654)
Total stockholders' equity	384,090	382,340
Total liabilities and equity	560,058	539,708
Nonrelated Party
ASSETS
Trade accounts receivable and accounts receivable from affiliates	36,635	37,429
LIABILITIES AND EQUITY
Accounts payable and accounts payable to affiliates	14,226	16,702
Affiliated Entity
ASSETS
Trade accounts receivable and accounts receivable from affiliates	6,377	7,860
LIABILITIES AND EQUITY
Accounts payable and accounts payable to affiliates	1,391	904
Class A Common Stock
Common stock:
Common stock	5,788	5,883
Class B Common Stock
Common stock:
Common stock	$ 1,566	$ 1,566